There found a great link up of Japan in World war 1 and World war 2. These link up of Japan is found nothing direct involvement of starting war, but playing a major role in war for gaining an extra economical benefit. Though, in first world war Japan had great achievement. Japanese achievement in first world war is a successful period. Japan became a great power adter first world war. Japan gain control over German occupied ocean and oil mines. Japan also occupied some chinese portion. Invasion of Manchuria is one of them. But, the success story of Japan not long lasting during second world war. Though, in second world war Japan innitially show great success by occupying Malay, Wast Asia and defeating great britain, but great defeat started when United State involve in war.